//
//  UITextField+Tool.m
//  ocCrazy
//
//  Created by mac on 2018/4/26.
//  Copyright © 2018年 dukai. All rights reserved.
//

#import "UITextField+Tool.h"
#import <objc/runtime.h>
#import "Tool.h"
static int _textMax = 0;

@implementation UITextField (Tool)


-(void)setTextMax:(NSInteger)textMax{
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textChange) name:UITextFieldTextDidChangeNotification object:nil];
    objc_setAssociatedObject(self, &_textMax, [NSNumber numberWithInteger:textMax], OBJC_ASSOCIATION_RETAIN);
}

-(NSInteger)textMax{
    
    return ((NSNumber *)objc_getAssociatedObject(self, &_textMax)).integerValue;
}

- (void)setPlaceHolderColor:(UIColor *)color{
    [self setValue:[UIColor whiteColor] forKeyPath:@"_placeholderLabel.textColor"];
}

- (void)setLeftViewWidth:(CGFloat)width{
    self.leftViewMode = UITextFieldViewModeAlways;
    self.leftView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, width, self.height)];
}


-(void)textChange{
    NSInteger kMaxLength = [self textMax];
    if (!kMaxLength) return;
    NSString *toBeString = self.text;
    //    NSString *lang = [[UITextInputMode currentInputMode] primaryLanguage]; // 键盘输入模式 ios7弃用
    NSString *lang  = [[UIApplication sharedApplication] textInputMode].primaryLanguage;
    if ([lang isEqualToString:@"zh-Hans"]) { // 简体中文输入，包括简体拼音，健体五笔，简体手写
        UITextRange *selectedRange = [self markedTextRange];
        //获取高亮部分
        UITextPosition *position = [self positionFromPosition:selectedRange.start offset:0];
        // 没有高亮选择的字，则对已输入的文字进行字数统计和限制
        if (!position) {
            if (toBeString.length > kMaxLength) {
                self.text = [toBeString substringToIndex:kMaxLength];
            }
        }
        // 有高亮选择的字符串，则暂不对文字进行统计和限制
        else{
            
        }
    }
    // 中文输入法以外的直接对其统计限制即可，不考虑其他语种情况
    else{
        if (toBeString.length > kMaxLength) {
            self.text = [toBeString substringToIndex:kMaxLength];
        }
    }
}

@end
